Top roll



Nov. 9, 1937. w STAHLECKER 2,098,436

TOP ROLL Filed March 2'7, 1956 INVENTOR. Wilhelm Srahlecker /4 r ATTORNEY.

Patented Nov. 9, 1937 TOP ROLL Wilhelm Stahlecker, Stuttgart-Bad-Oannstatt, Germany, assignor to Vereinigte Kugellagerfabriken Aktiengesellschaft,

Stuttgart-Bad- Cannstatt, Germany, a corporation of Germany Application March 27, 1936, Serial N0. 71,080 In Germany March 29, 1935 3 Claims.

This invention relates to a special construction and arrangement especially of the top rolls (front rollers) of drawing mechanisms for textile frames, for instance ring spinning frames, and refers chiefiy to top rolls the outer shell 01" which, covered With a special coat (leather, cork etc.) is fitted upon a bearing body r support and can be removed easily.

The outer surface of the top rolls is furnished in the form of a soft and elastic coat made of leather, cloth er cork which becomes worn in use anti therefore must be replaced from time to time. F01 replacement of these coats it is necessary to put the rolls or at least the outer part of them in boiling 1ye. Such a treatment being detrimental to anti-friction bearings when these are used, lt has been proposed to use a well sealed bearing unit upon which the outer shell is loosely tted in order to facilitate removal.

The fit of the outer shell should preferably allow a certain amount of self-alignment upon the bearing body in order to compensate for irregularities of the coat or lap formation due to impurities on the rollers. The loose fit makes it possible that the neighbored rol1er of the same pair will not be disturbed. 'Ihis yielding, loose fit can only be obtained i1 the bore of the outer shell 1s somewhat larger in diameter than the bearing body. Such difference in diameter 30 causes a rolling movement between the inside of the outer shell ancl the outside 0f the bearing body. It is desirable to permit such movement because otherwise a sliding movement Will prevail, thus causing quickly contact oxidation requiring premature replacement of the top rolls. The latter circumstanoe makes it impossible 130 apply rneans such as springs for holding the outer shell in axial direction, since these cause a pressure between the bearing body and outer 4 shell, preventing a free mutual rolling movement of these two parts.

This present invention has in view to fit loosely the outer shell upon its support, allowing a free rolling movement. Furthermore the outer shell 5 is guided in an axial direction by projectlng means such as shoulders or flanges which permit the free rolling movement am]. the disassembling.

In the attached drawing an example of this construction is illustrated, in which drawing:

Figure 1 shows a longitudinal section of the shell hereinafter described and the elevation of a roller body mounted upon a broken away shaft. The covering of the shell is shown in contact with conventional representation of the cooperative roll.

Figure 2 shows the part shown in Figure 1, the shell moved out of its normal positlon, and

Figure 3 is a view taken at about right angles to the plane of Figures 1 and 2 showing the shell moved out of alignment with the shaft.

The outer shell c which is covered with soft material preferably leather, works together with the roll a made of harder materlal preferably steel, and is frequently fluted.

The outer shell is shown supported by the antifrlctlon bearing outer race rings or bearing body d which run f1eely by means of balls or rollers upon the fixed (that is not rotating) shaft e.

The outer shell c is chambered out in its middle portion, having a somewhat greater diameter than at the ends, thus forming a supporting surface f with annular shoulders g. These shoulders have a larger diameter than the diameter of the bearing body d and an axial distance apart also a little longer than is the axial length of the bearing body d.

The small amount of clearance between the outer shell c and the bearing body d permits a slow and free rolling movementpf the outer shell upon the bearing body.

It is very easy to remove the unter shell from the bearing body, and 190 reassemble another shell upon it. Furthermore it is possible that even a wrong adjustment of the outer shell, for instance if the latter is not put entirely upon the bearing bocly but only unilaterally, that in such a case the running outer shell will correct itself anal run into the proper position. This circumstance ls 01 great importance because the Workmen operating the spinning f rame do not possess enough knowleclge nor give special attention with regard to the handling 0f the machine.

It has been shown in Figures 2 and 3, how this running in the proper position will take place if after the assembling a unilateral position is prevailing. An unter shell being in such a wrong position runs quickly into its normal position, as can be easily observed in practice. It is obvious that the outer shell has always the intention to remain in its proper position because it is impossible for it with the fiange g t0 climb up on the bearing body d.

Having thus described my invention, I clalm and desire to secure by Letters Patent:

1. A top roll for drawing mechanisms, comprising a shaft, a, bearing body carried by the shaft, an outer shell provided with a special coat,

the bore 015 the outer shell being somewhat larger in diameter than is the diameter of the bearing body, thereby being loosely fitted and freely rolling on the bearing body, the shell being provided with inwardly projecting flanges for engaging the bearing body to guide and 1ocate the she1l.

2. A top roll for drawing mechanisms, comprising a shaft, a, bearing body carried by the shaft, an outer she1l provided. with a special coat the shell being chambered out in its middle position, having a greater diameter than at its ends, and being loosely fitted and freely rolling on the 10 bearing body.

prising a. shaft, a bearing body carried by the shaft, an outer Shell, the bare of the outer shell being somewhat 1arger in diameter than 1s the diameter of the bearing body, thereby loosely fitted and freely rolling on the bearing body, the shell being provided with inwardly projecting flanges for engaging the b6aring body to guide and locate the shell, and. an elastic coat on the Shell.

WILHELM STAHLECKER. 

